AgentsModule

Agents.jl

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Agents.jl is a pure Julia general-purpose framework for agent-based modeling (ABM): a computational simulation methodology where autonomous agents react to their environment (including other agents) given a predefined set of rules. Some major highlights of Agents.jl that set it apart from other similar frameworks are:

  1. It is simple: has a very short learning curve and requires writing minimal code
  2. Has an extensive interface of thousands of out-of-the box possible agent actions
  3. It is fast (typically faster than established competitors)
  4. Straightforwardly allows simulations on Open Street Maps
  5. Allows both traditional discrete-time ABM simulations as well as continuous time "event queue" based ABM simulations
  6. Provides native integration of ABM simulations with Reinforcement Learning (RL)

More information and an extensive list of features can be found in the documentation, which you can either find online or build locally by running the docs/make.jl file.

Agents.jl is part of JuliaDynamics, an organization dedicated to creating high quality scientific software.

Citation

If you use this package in a publication, or simply want to refer to it, please cite the paper below:

@article{Agents.jl,
  doi = {10.1177/00375497211068820},
  url = {https://doi.org/10.1177/00375497211068820},
  year = {2022},
  month = jan,
  publisher = {{SAGE} Publications},
  pages = {003754972110688},
  author = {George Datseris and Ali R. Vahdati and Timothy C. DuBois},
  title = {Agents.jl: a performant and feature-full agent-based modeling software of minimal code complexity},
  journal = {{SIMULATION}},
  volume = {0},
  number = {0},
}
source
Star us on GitHub!

If you have found this package useful, please consider starring it on GitHub. This gives us an accurate lower bound of the (satisfied) user count.

Latest news: Agents.jl v7

This new version brings two powerful and experimental features:

  1. Allowing the agent container to be based on StructVectors, using a Struct-of-Arrays internal layout. This can increase simulation computational performance however it currently only supports single agent types. To use this, pass container = StructVector to StandardABM or EventQueueABM constructors, as well as use the helper construct SoAType{A} for dispatch purposes instead of your agent type A (read the docstring of SoAType).
  2. Native integration of ABMs with Reinforcement Learning is now provided by the new model type ReinforcementLearningABM. To learn how to use this functionality checkout the new tutorial on the Boltzmann Wealth Model with Reinforcement Learning.

There is also a minor breaking change: the internal code for plotting has been fully reworked. This does not affect typical users, as all plotting API remains identical, but it does affect users that were extending plotting for custom spaces. As a result of this change, hovering data inspection is currently disabled.

Highlights

Software quality

  • Free and open source.
  • Small learning curve due to intuitive design based on a modular space-agnostic functional modelling implementation.
  • User-created models typically have much smaller source code versus implementations in other open source ABM frameworks (proof), making them faster to prototype and modify.
  • Excellent computational performance, typically faster than established competitors.
  • High quality, extensive documentation featuring tutorials, example ABM implementations, an extra zoo of ABM examples, integration examples with other Julia packages, and developer's docs.

Agent based modelling specifically

  • Universal model structure where agents are identified by a unique id: AgentBasedModel.
  • Extendable API that provides out of the box thousands of possible agent actions.
  • Support for many types of space: arbitrary graphs, regular grids, continuous space
  • Support for simulations on Open Street Maps including support for utilizing the road's max speed limit, finding nearby agents/roads/destinations and pathfinding.
    • See this highlight for a simulation of the whole city of Chicago.
  • Modular design allows the creation of entirely new types of space configurations that can be integrated fully with the rest of Agents.jl API with only a few lines of code.
  • Multi-agent support, for interactions between disparate agent species.
  • Support for both discrete time and continuous time (event queue or jump processes) type of simulations.
  • Scheduler interface (with default schedulers), making it easy to activate agents in a specific order (e.g. by the value of some property).
  • Automatic data collection in a DataFrame at desired intervals.
  • Aggregating collected data during model evolution.
  • Distributed computing.
  • Batch running and batch data collection.
  • Extensive pathfinding capabilities in continuous or discrete spaces.
  • Reinforcement learning native integration.
  • Customizable visualization support for all kinds of models via the Makie ecosystem: publication-quality graphics and video output.
  • Interactive applications for any agent based models, which are created with only 5 lines of code and look like this:

Getting started

To install Agents.jl, launch Julia and then run this command:

using Pkg; Pkg.add("Agents")

To learn how to use Agents.jl, please visit the Tutorial before anything else.

Use the latest released version

After adding Agents.jl to your project, please check if the most up to date stable version has been installed. The versions of the installed packages in the project can be checked by running Pkg.status(). Only the latest version of Agents.jl provides all the features described in this documentation. It is generally advised against using earlier versions as they will likely only work partially and are not supported anymore.

Design philosophy of Agents.jl

Agents.jl was designed with the following philosophy in mind:

Simple to learn and use, yet extendable and highly performant, allowing for fast and scalable model creation and simulation.

There are multiple examples that highlight this core design principle, that one will quickly encounter when scanning through our API page. Here we just give two quick examples: first, there exists a universal function nearby_agents, which returns the agents nearby a given agent and within a given "radius". What is special for this function, which is allowed by Julia's Multiple Dispatch, is that nearby_agents will work for any space type the model has, reducing the learning curve of finding neighbors in ABMs made with Agents.jl. An even better example is perhaps our treatment of spaces. A user may create an entirely new kind of space (e.g. one representing a planet, or whatever else) by only extending 5 functions, as discussed in our Creating a new space type documentation. Indeed, the simplicity of Agents.jl is due to the intuitive space-agnostic modelling approach we have implemented: agent actions are specified using generically named functions (such as "move agent" or "find nearby agents") that do not depend on the actual space the agents exist in, nor on the properties of the agents themselves. Overall this leads to ultra fast model prototyping where even changing the space the agents live in is matter of only a couple of lines of code.

Many other agent-based modeling frameworks have been constructed to ease the process of building and analyzing ABMs (see e.g. here for an outdated review), spanning a varying degree of complexity. In the page ABM Framework Comparison we compare how our design philosophy puts us into comparison with other well accepted ABM software. Fascinatingly, even though the main focus of Agents.jl is simplicity, ease of use, and extendability, it runs faster than all software we compared it with.

Crash course on agent based modeling

An agent-based (or individual-based) model is a computational simulation of autonomous agents that react to their environment (including other agents) given a predefined set of rules [1]. ABMs have been adopted and studied in a variety of research disciplines. One reason for their popularity is that they enable a relaxation of many simplifying assumptions usually made by mathematical models. Relaxing such assumptions of a "perfect world" can change a model's behavior [2].

Agent-based models are increasingly recognized as a useful approach for studying complex systems [3,4,5,6]. Complex systems cannot be fully understood using traditional mathematical tools which aggregate the behavior of elements in a system. The behavior of a complex system depends on both the behavior of and interactions between its elements (agents). Small changes in the input to complex systems or the behavior of its agents can lead to large changes in outcome. That is to say, a complex system's behavior is nonlinear, and that it is not only the sum of the behavior of its elements. Use of ABMs have become feasible after the availability of computers and has been growing ever since, especially in modeling biological and economic systems, and has extended to social studies and archaeology.

An ABM consists of autonomous agents that behave given a set of rules. A classic example of an ABM is Schelling's segregation model, which we implement as an example here. This model uses a regular grid and defines agents at random positions on the grid. Agents can be from different social groups. Agents are happy/unhappy based on the fraction of their neighbors that belong to the same group as they are. If they are unhappy, they keep moving to new locations until they are happy. Schelling's model shows that even small preferences of agents to have neighbors belonging to the same group (e.g. preferring that at least 30% of neighbors to be in the same group) could lead to total segregation of neighborhoods. This is an example of emergent behavior from simple interactions of agents that can only be captured in an agent-based model.

Getting help

You're looking for support for Agents.jl? Look no further! Here are some things you can do to resolve your questions about Agents.jl:

  1. Read the online documentation! It is likely that the thing you want to know is already documented, so use the search bar and search away!
  2. Chat with us in the channel #dynamics-bridged in the Julia Slack!
  3. Post a question in the Julia discourse in the category “Modelling and simulations”, using agents as a tag!
  4. If you believe that you have encountered unexpected behavior or a bug in Agents.jl, then please do open an issue on our GitHub page providing a minimal working example!

Contributing

Any contribution to Agents.jl is welcome! For example you can:

  • Add new feature or improve an existing one (plenty to choose from the "Issues" page)
  • Improve the existing documentation
  • Add new example ABMs into our existing pool of examples
  • Report bugs and suggestions in the Issues page

Have a look at contributor's guide of the SciML organization for some good information on contributing to Julia packages!

Citation

If you use this package in work that leads to a publication, then please cite the paper below:

@article{Agents.jl,
  doi = {10.1177/00375497211068820},
  url = {https://doi.org/10.1177/00375497211068820},
  year = {2022},
  month = jan,
  publisher = {{SAGE} Publications},
  pages = {003754972110688},
  author = {George Datseris and Ali R. Vahdati and Timothy C. DuBois},
  title = {Agents.jl: a performant and feature-full agent-based modeling software of minimal code complexity},
  journal = {{SIMULATION}},
  volume = {0},
  number = {0},
}

Reproducibility

The documentation of Agents.jl was built using these direct dependencies,
Status `~/work/Agents.jl/Agents.jl/docs/Project.toml`
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Info Packages marked with  and  have new versions available. Those with  may be upgradable, but those with  are restricted by compatibility constraints from upgrading. To see why use `status --outdated`
and using this machine and Julia version.
Julia Version 1.12.5
Commit 5fe89b8ddc1 (2026-02-09 16:05 UTC)
Build Info:
  Official https://julialang.org release
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 4 × AMD EPYC 7763 64-Core Processor
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  GC: Built with stock GC
Threads: 1 default, 1 interactive, 1 GC (on 4 virtual cores)
Environment:
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A more complete overview of all dependencies and their versions is also provided.
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Info Packages marked with  and  have new versions available. Those with  may be upgradable, but those with  are restricted by compatibility constraints from upgrading. To see why use `status --outdated -m`

You can also download the manifest file and the project file.